Pressure cooker



FIG. 1 is a front view of a pressure cooker showing the new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a top, perspective view thereof.

The broken lines in the drawings depict portions of the pressure cooker that form no part of the claimed design. 

CLAIM I claim the ornamental design for pressure cooker, as shown and described. 